pidgin/pidgin

Remove the account parameter from purple_credential_provider_*_finish functions.

Testing Done:
Compiled and make sure the unit tests passed.

Reviewed at https://reviews.imfreedom.org/r/305/
subdir('bonjour')
subdir('facebook')
subdir('gg')
subdir('irc')
subdir('jabber')
subdir('novell')
subdir('null')
subdir('sametime')
subdir('silc')
subdir('zephyr')